5. True experiments have at least three features that help establish the

5. True experiments have at least three features that help establish the first three criteria for causality.  Name those features and explain how they accomplish this. 

6. What are the threats to internal validity and generalizability in experiments? 

7. What are the five basic sources of internal invalidity?

8. What is the difference between a cross-sectional and longitudinal research design?

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